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    <title>Document</title>
</head>
<body>
    <!-- <script src="./2.js"></script> -->
    <input type="text" id="searchInput">
    <span id="searchSpan"></span>
    <script>
    // 双向绑定
    const searchInput = document.getElementById('searchInput');
    const searchSpan = document.getElementById('searchSpan');
    const obj = {value:''}; // 被代理对象的
    // const proxyObj = new Proxy(obj, {
    //     set: function(target, key, val) {
    //         console.log('-------------------')
    //         searchSpan.innerHTML = val;
    //         target[key] = val;
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    Object.defineProperty(obj,'value',{
        set: function(newVal) {
            console.log('set val:' + newVal);
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        }
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        obj.value = e.target.value;
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